Signal module



FIG. 1 is a perspective view of a signal module.

FIG. 2 is a front view of the signal module illustrated in FIG. 1; the rear being a mirror image thereof.

FIG. 3 is a side view of the signal module shown in FIG. 1; the other side being a mirror image thereof; and,

FIG. 4 is a top view of the signal module illustrated in FIG. 1; the bottom being a mirror image thereof.

The signal module is shown broken away in FIGS. 1, 2 and 3 of the drawings to indicate indeterminate length, it being understood that it has a uniform shape and appearance throughout its length.

The features indicated in the figures in broken lines form no part of the claimed design. 

The ornamental design for a signal module, as shown and described. 